Character driver finished

select_poll/poll1.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+int main(){
+    int fd1, fd2;
+    struct pollfd pollarray[10];
+    char buf[10];
+    int n;
+    
+    fd1 = open("./pone", O_RDWR);
+    fd2 = open("./ptwo", O_RDWR);
+    pollarray[0].fd = fd1;
+    pollarray[1].fd = fd2;
+    pollarray[0].events = POLLIN;
+    pollarray[1].events = POLLIN;
+
+    n = poll(pollarray, 2, 10000);
+    if(n < 0){
+        perror("poll:");
+        exit(1);
+    }
+
+    //test whether fd1 is ready or not
+    if( (pollarray[0].revents & POLLIN)){
+        printf(" reading from fd1 (pone)\n");
+        n = read(fd1, buf, 10);
+        printf(" read data = %s from pone\n", buf);
+    }
+
+
+    //test whether fd2 is ready or not
+    if( (pollarray[1].revents & POLLIN)){
+        printf(" reading from fd2 (ptwo)\n");
+        n = read(fd2, buf, 10);
+        printf(" read data = %s from ptwo\n", buf);
+    }
+
+    // close(fd1);
+    // close(fd2);
+    return 0;
+}